/**
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef COMPILER_OPTIMIZER_OPTIMIZATIONS_LOOP_UNSWITCH_H_
#define COMPILER_OPTIMIZER_OPTIMIZATIONS_LOOP_UNSWITCH_H_

#include "optimizer/optimizations/loop_transform.h"
#include "compiler_options.h"

namespace panda::compiler {
class LoopUnswitch : public LoopTransform<LoopExitPoint::LOOP_EXIT_BACKEDGE> {
public:
    explicit LoopUnswitch(Graph *graph, uint32_t max_level, uint32_t max_insns)
        : LoopTransform(graph),
          loops_(graph->GetLocalAllocator()->Adapter()),
          max_level_(max_level),
          max_insns_(max_insns)
    {
    }
    bool RunImpl() override;
    const char *GetPassName() const override
    {
        return "LoopUnswitch";
    }

    void InvalidateAnalyses() override;
    bool IsEnable() const override
    {
        return OPTIONS.IsCompilerLoopUnswitch();
    }

private:
    bool TransformLoop(Loop *loop) override;
    bool IsHoistable(Inst *inst, Loop *loop);
    bool AllInputsConst(Inst *inst);
    ArenaQueue<Loop *> loops_;
    const uint32_t max_level_ {0};
    const uint32_t max_insns_ {0};
    bool is_applied_ {false};
};
}  // namespace panda::compiler

#endif
